Northampton land cover change 2001-2019

Author

Kent Johnson

Introduction

This report uses data from the National Land Coverage Database (NLCD) to summarize land cover changes in Northampton, Mass. from 2001 to 2019.

The NLCD provides data on land cover and land cover change at a 30 meter resolution. Each 30m square is classified into one of 16 land coverage categories. Data releases every three years, from 2001 to 2019, allow monitoring land cover changes at the resolution of the data.

For this report, the sixteen land cover categories in the NLCD were consolidated to six classes. See the land cover table below for details.

The NLCD data is available from the Multi-Resolution Land Characteristics Consortium. An interactive viewer for the underlying data is available here.

Land cover change in Northampton

These tables and charts show land cover change for the City as a whole.

The first chart shows land cover change since 2001. There has been substantial increase in developed land and decrease in forested land. There are has also been a loss of cultivated land and an increase in herbaceous and shrub land.

The second chart gives more detail on the changes. The first chart, above, gives the impression that forest land has been developed and cultivated land has gone to herbaceous and shrub.

The sankey diagram below gives a more nuanced view, showing the “from” and “to” flow of land cover change. It shows that some of the loss of forest land is due to development, but some forest land has changed to herbaceous/shrub. Most of the lost cultivated land has been developed but small amounts changed to forest and herbaceous/shrub.

This table shows the numbers underlying the sankey diagram above. For example, for acres that were forested in 2001 and not it 2019, it shows the number of acres for each new classification.

Land cover change in Northampton, 2001-2019
Change in acres from 2001 land cover category to 2019 category
2001 Category 2019 Category
Developed Herbaceous/Shrub Forest Cultivated Water/Wetland Other
Forest 137 62 0 8 1 1
Cultivated 54 4 14 0 3 0
Herbaceous/Shrub 5 0 14 3 0 0
Other 8 4 0 0 0 0
Water/Wetland 4 7 1 5 0 0
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

This table shows land cover for the City in acres and as a percent of total area, and the change in acreage from 2001 to 2019. The “Percent change” column is the change in acreage as a percent of acreage, not the change in percent of total acres.

Land Cover Acres in Northampton, 2001-2019
2001 2019 Change Percent Change
Acres Percent Acres Percent Acres
Developed 5,966 26% 6,174 27% 208 3%
Forest 10,853 47% 10,672 47% -181 -2%
Cultivated 2,496 11% 2,437 11% -59 -2%
Water/Wetland 3,437 15% 3,424 15% -13 0%
Herbaceous/Shrub 81 0% 136 1% 55 68%
Other 49 0% 38 0% -11 -22%
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

The map below show where the land cover classification changed from forest in 2001 to something other than forest in 2019. The changed areas are colored to show the 2019 classification.

Land cover by zoning category

These tabs show land cover change within zoning categories. The categories aggregate the City zoning districts.

The maps show the zoning districts in grey and the areas of lost forest cover in red.

Rural zones include zoning districts FFR, RR and SC.

Land cover change in Rural zones, 2001-2019
Change in acres from 2001 land cover category to 2019 category
2001 Category 2019 Category
Developed Herbaceous/Shrub Forest Cultivated Water/Wetland Other
Cultivated 41 0 9 0 2 0
Forest 21 33 0 4 1 0
Water/Wetland 1 7 1 4 0 0
Herbaceous/Shrub 0 0 3 3 0 0
Other 1 0 0 0 0 0
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson
Land Cover Acres in Rural zones, 2001-2019
2001 2019 Change Percent Change
Acres Percent Acres Percent Acres
Developed 1,348 11% 1,411 11% 63 5%
Forest 6,311 50% 6,265 49% -46 -1%
Cultivated 1,986 16% 1,945 15% -41 -2%
Water/Wetland 2,977 23% 2,967 23% -10 0%
Herbaceous/Shrub 47 0% 82 1% 35 74%
Other 11 0% 10 0% -1 -9%
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

Suburban residential includes zoning districts SR and WSP.

Land cover change in Suburban/Water supply zones, 2001-2019
Change in acres from 2001 land cover category to 2019 category
2001 Category 2019 Category
Developed Herbaceous/Shrub Forest Cultivated Water/Wetland
Forest 76 29 0 5 0
Herbaceous/Shrub 2 0 12 0 0
Cultivated 8 4 5 0 1
Other 3 4 0 0 0
Water/Wetland 0 0 0 0 0
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson
Land Cover Acres in Suburban/Water supply zones, 2001-2019
2001 2019 Change Percent Change
Acres Percent Acres Percent Acres
Developed 1,520 24% 1,609 25% 89 6%
Forest 4,057 63% 3,963 62% -94 -2%
Cultivated 437 7% 426 7% -11 -3%
Water/Wetland 370 6% 370 6% 0 0%
Herbaceous/Shrub 29 0% 52 1% 23 79%
Other 22 0% 15 0% -7 -32%
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

Urban residential includes zoning districts URA, URB and URC.

Land cover change in Urban zones, 2001-2019
Change in acres from 2001 land cover category to 2019 category
2001 Category 2019 Category
Developed Other Herbaceous/Shrub
Forest 15 1 0
Cultivated 0 0 0
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson
Land Cover Acres in Urban zones, 2001-2019
2001 2019 Change Percent Change
Acres Percent Acres Percent Acres
Developed 2,207 85% 2,222 85% 15 1%
Forest 290 11% 274 11% -16 -6%
Cultivated 49 2% 49 2% 0 0%
Water/Wetland 50 2% 50 2% 0 0%
Herbaceous/Shrub 1 0% 1 0% 0 0%
Other 4 0% 5 0% 1 25%
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

Business/industrial includes zoning districts GB, GI, HB, M, NB, OI and PV.

Land cover change in Business/industrial zones, 2001-2019
Change in acres from 2001 land cover category to 2019 category
2001 Category 2019 Category
Developed
Forest 25
Cultivated 5
Other 5
Water/Wetland 3
Herbaceous/Shrub 3
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson
Land Cover Acres in Business/industrial zones, 2001-2019
2001 2019 Change Percent Change
Acres Percent Acres Percent Acres
Developed 647 70% 687 75% 40 6%
Forest 194 21% 169 18% -25 -13%
Cultivated 22 2% 17 2% -5 -23%
Water/Wetland 41 4% 38 4% -3 -7%
Herbaceous/Shrub 3 0% 1 0% -2 -67%
Other 13 1% 8 1% -5 -38%
Data: Multi-Resolution Land Characteristics Consortium | Analysis: Kent S Johnson

Central business zones include zoning districts CBc, CBg, CBs, FVc and FVg.

These zones consist entirely of developed land; there is no change between 2001 and 2019.

Land cover classes

For this report, the sixteen land cover categories in the NLCD were consolidated to six classes. This table shows the land cover categories in the NLCD and the consolidated classes to which they have been assigned.

Reporting classes for NLCD categories
NLCD category
Developed Developed, Open Space
Developed, Low Intensity
Developed, Medium Intensity
Developed, High Intensity
Forest Deciduous Forest
Evergreen Forest
Mixed Forest
Cultivated Hay/Pasture
Cultivated Crops
Water/Wetland Open Water
Woody Wetlands
Emergent Herbaceuous Wetlands
Herbaceous/Shrub Shrub/Scrub
Herbaceuous
Other Unclassified
Perennial Snow/Ice
Barren Land

Copyright 2023 Kent S Johnson Creative Commons License 2023-01-25